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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ca4f7ded4dc50ec23c1ba1949f9df1b489abd3479083e9e2e40674a0215284e0' 
  AND token = 'JY2FCQMthSw/0E9TeDwxChDdzjsNIAEq6DWt217WQw8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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