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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '52065d2d9705de5c21db72db1ddcc8c4783d49cab9acc55cfffb195f2b571a01' 
  AND token = '70yPS1rxa7fS6fBa+Kmj4rEI/OVI2a+hltJBe1Cg4gk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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