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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6bb68cda9ba0c2be6b669fd7456158ae0d72dd5dc5ea3cfd37a9be8f4030e428' 
  AND token = 'fdodxARKLRAbcut2dwn7RBRLbglvlR0QUzp/z6HkOtw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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