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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5b786735b8c5d72c361978d364a24f1748e8a807ccb34a741a40c5dc483993dc' 
  AND token = 'd5P2kSz1pT/shuojDcAU1M+N2/BhnC3aTFK1wv6lr1k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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