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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '04c1acf415defb8f91c6bf7d732e4d09dbd792e64bde33b3b70ab0ada5a23802' 
  AND token = '5SK0Obqh+u8NcKqO7lTMxaYIpzx0AHPAAwzaXAYURPM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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