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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '86a1f16128ddb90699f71f79d847494b10f129544f3d10b00ac331e0c46ad7e6' 
  AND token = '3xvFmNiF8FI85+W+exHbWne1X6Ijb4f/Cq5LxkqeTvM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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