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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3f66c465fa6216a186f3d4a03255ae2ca8133aba51d90f43685d13bee2e20403' 
  AND token = 'YdYJYgmemQ0uZbIW3EK7i8yNdHMU6pgOzWDvICflH+Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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