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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc886f3b2f8aa4d5127e617d62cd2052e79114c67c819f4a688fd51a2ff2f9ae' 
  AND token = 'UgAlmqqFcCmCuuHYXZp2pmlaVeH1c1bP1tBK3qIi5L4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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