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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd152825bbf618534ec3346e336b5ce2fd82d5aeb109c773bfc2a387faa906e94' 
  AND token = 'XRhoH2EJHwqClyu/qtoeL5qyi2KRmeEsnXbLQg67Px4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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