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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '09e28c5f5eade551f8585aaa1bb7123e30f0fcd7837dcfe3ee4b9f6104c07b24' 
  AND token = 'Xi90DFNJdZSnD6birNFGn89vCKIq9Qc9ie+2fWFYbQs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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