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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5cce7de5ef21c3e155d0e1a054f5004e0c3075c305a80963d1f883befda3e65c' 
  AND token = 'jVUMY5mDdm0KKK77D759amdEntCNzvZVKwonSN3dwUo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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