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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a5ae4762b84bedf0fca2abe91f83fcca4417b77c69b3076cd69ba32ee7fb14b6' 
  AND token = '1LoQ2VVh3FoEYW669hdc3Zk0VuyFBrz+tFq42r3WDS0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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