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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6e9fb6a1079c192f6c0788e1dca1fdb46f0671144f4603cf58608c2c0030af81' 
  AND token = 'Mu8KGHxUrEoQz0Hicl3kCZzIFdjzNhTSH5pa4R5Onrg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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