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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0a98d2760c9006293e108a708d14f5e8c1368fac9c81a0ad3f01bb4b8b3679b9' 
  AND token = '+WhLRytJS97d5/QJj2zppknSvK7qxl8C/zRn3YI5dL4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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