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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b7dafab4847428d116c83c5a09c23821298090d34aba4afd75b8400d3fe0920f' 
  AND token = 'yeT6yjUTCiY92BMbkc5DCd+31MK2NQPca3jxT7QfQKo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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