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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7aa7c8c437a4806e18bce59429ddca83e3f0116a0b593d2f2fdf6f3335ae77fd' 
  AND token = 'fEPVSq6jXXrjw+D8tSdFmxROVYpF+CeL7WgWrd4U8ZU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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