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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5fa75ccc903bf7d78c4a6f488844f39ce963ffb38920ab8a7cdf68116537d0ce' 
  AND token = 'MctRrB48gc4MjnvS6FYqc4iLmLTtJZtQsfNBrnP7P/k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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