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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '064d4e17d4b778cefd8a39473d20db6281a85e62ba813175363ebd770f293f30' 
  AND token = 'ojEN5oDGH81OhRIFt2CkkWg9L1N56ZEMuf5OtR2jFqE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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