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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ed918769cb90331312a73796ea6ab6f8cc27c40f0c3e452d04ce51a5147af85e' 
  AND token = 'pfw0N5LoJyGeFFm3PdLPggrBuKePVw9JHo2OJM9op5o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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