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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '637117a196b117abc0f2a1a3d32328d0fd7b8f4e3ae417f443b7d4df4f5e4073' 
  AND token = 'OrWZ3XM+bfUmcYm9Bdw9PM1QeJjeD3ooh4D6twZlVK4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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