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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ae0448bfb2eec08bddc8f93a162579559eb429eceebc534789cc31c6d011a2c0' 
  AND token = 'x0Hmo7JNFHG8qPGIlX12kmTlAs4w0ccJm+AYp4AO3+g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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