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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3076e53107d77f4d26e2105f67639ee602fa5735d4dd3c75908f32111792787f' 
  AND token = '0WjO5Jg/ut0IBu9W+ytJ+QPkKZaj4Dl04qptcSR+M4s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00117

JSON explain

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