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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '57463b2de87975023691a97137dda0479a7b7d9719cf88af12e94448dbe408a0' 
  AND token = 'XG4nf1YgmvyGki6Kke/f+rwol6DixxXkrZCG3R5Ji+8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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