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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cb2c3660f93231f6aad5bcec27a07c5676edcb549315918785a7b2def38342e3' 
  AND token = 'i+gabOaqGihu5e9QkbBggT4PYbVQd8OJ8n/1Lp8cvyg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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