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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3f67b51179d623ad11252f64160c415f4a855a99151449209719c5a5737b8153' 
  AND token = 'qE7s9DliWsLs4fOd39rFE4EriK1gXbowsYhVVYiibvQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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