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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '386c33077f74e23658427d13841c3139e843b78c7f5ebf541346bc904f6cf6db' 
  AND token = 'aR20PCweNvsiOnikTE2jX3A+P6FH7ugJeSFisN2x5t4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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