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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '248c314f904ed30589df26042f6c8664f2245d4206bb618430e6cb947fe89c04' 
  AND token = 'Z1h2PSgCbNbQD+EDEQyIJw+JLp14AU8w1rvzlE4qyqc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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