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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a90d62aa56301f632f3c8879e827d99654dd60e6c7a893baaa766d38dd4cdfb0' 
  AND token = 'Qw1vvLkau0VAC/xTSa2YNINcuUUbXN8oTwAipofmeQM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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