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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3bfbafd93a60b8d53bd114cf97ddbbe32e78ffaea0db856fa08f96225a0e08a4' 
  AND token = 'Gvzv0OsApCFX7FjQNY6yjCg2NNLIfaJUJ3e6hmqpzR0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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