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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b98018a16b982172e6d01b0a63d1e9cde647af4146f5c27355233bd4d5e467a4' 
  AND token = 'F2HEtZB7J+/jjQ/BEKAYMzM1VhtArbBo3BDaPEeq41c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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