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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c0432894e226461fa4c424232def4947be316a63ff44b9e64428ffd0b66104b1' 
  AND token = 'vk17r+5mbMu5UyiBm3jMrZeRB/ESzj0Obh9d3A+tvJ0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00067

JSON explain

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