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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b29bc2d3191b2232b499d2b102b74ddceb2629c6035a76fc0164d3aed1d57d52' 
  AND token = '5AyZOpA9DIl3/rXioz1ckA1XGJhJa7yMbweCKwWMYpw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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