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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c80bfb2eea7ebbce404695844e79daeb0ba481081e12ec088c4b36c6a7dd1318' 
  AND token = 'BL09BPTMKCPhzfeoereXiEptDzzZPuEjfqRfl6r7uSM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00115

JSON explain

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