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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'affff77a81efd75d47a0b7fd4fcda5a182af26eb12a57179bbafc5d9f576abee' 
  AND token = 'drAW+2rGIVS6Maq8I1CR27IIvZbfiPfT18bUReZax/g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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