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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1eee8d867ee76d410826378b9184b87c947ff2edc03645b7a62d0a635ba8e4eb' 
  AND token = 'wqs3E9vVFELhhWTxGlmXqQqpkeHhyfnlpvvu8TXcxQM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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