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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7e7ac3afee64bb9c778e250c499c1d6937e11ed7a5a70e25bfd4308ac713f7d1' 
  AND token = 'JJNOHaaJWbNBub302LHKD0nX+QKMyVC87kcI2g+oHKo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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