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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5b943c3460fddf75356491c06f511586abf5cbdc871b1545431da83da3c14333' 
  AND token = 'Oz+c65bfYuIYXpwatT8TbMx/4D/WI5aTc/JU73/jZTQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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