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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6e66eca5c6b5ec51909b53550d0d5b8ca4a695b2ebd326fbaf81ef14a83b3778' 
  AND token = '3hQ5JxrF+1cEWKM9FSlT9hzdufSceVoWR15v2NE3KjI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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