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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b34b23420124a13922c30c3579313dfd9bd1f9d43a97d536ffbd519007077b7d' 
  AND token = 'LKBPcl94ABtSm+Nk7KmSGaG7H/tNd4FToLMHf4d46gQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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