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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7eac351e3cac3efbaca2ec7c20289fdf3bda0fc3e6d0ead28b57a1d66e11651a' 
  AND token = 'd1KHm4ox2QIHWO1nmyVRG2WpnfgvwmZ7Nl5RQM8m6VQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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