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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ddc4ff4ec5912686105e70fbec6152e00a64f7902ad0d220b35034f5a1271b46' 
  AND token = '6xOSd3z9QUv/lSfsgmoauho9ArFpdhrX5mSJ7U4UQiY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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