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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '093132dd2a343f1d46bbb467bd0a47c74bfccef353d1a40913caa54f5b059994' 
  AND token = 'qDJOOgBCqHOki2oZLN7fXb+EXPs2wKRR5DX4Y/5YR1o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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