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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3112002ecb02396a2a2b54279e9ae98dbd156dacda3fbe4fcab0de6d545b4179' 
  AND token = 'mtZUmEnCBC3PlEgl27li2dcMQ5wvjahb2V0ap9fR4PM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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