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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'feef7e382ba8af91b61d489a729bc21af5543a2296741b2ca2c963621949a893' 
  AND token = 'Sm0w9caEumDFb5lH6xL3x+HqENiOhM5lK24XDHi8+FE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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