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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5bca30ef73e55c8e4b8816d643bf54ac7a968005f44010b2b0cb11ee3a016762' 
  AND token = 'QtM61fU6x7dwtn3/40qzZE19lXdoMpQLRw6a5uNqHO8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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