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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c5a6634b927071fb96a1b68b6dcf62b9df500da93102af1c76fd3567539087a3' 
  AND token = 'X5NuFEZGmX895HLoZEWkVT7vbd7oM4JK9Q/W91bzrzI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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