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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '63f082e45f1d526e4eb1c00f010cfc76b91f733d494f638bb774cc45c492e490' 
  AND token = 'wDcftuNoEW5EOlqW5C+I2omZoA7DS0ud6TK2XdrwU2g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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