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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '862e394db4adc6e2bb970f6210c4ae0c09f5bd61c55674ce49bc797131a3d3a3' 
  AND token = 'K5OZZXpEPvLP3EAGG0CVUECIp9NCItM54+1fVwXfWOQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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