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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd7e84137ff3e492cf91f8ba94930a84c40b4e1ccd98260cffcfc05a6cf90f04d' 
  AND token = '4lhmPW0pX5FQZaO+igChBBSNc0dIzy40H3RRWKDgV20=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00082

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}