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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6618dd8de634cc1732725ee80877796967c215cac2f3a49231db646bab1ed52e' 
  AND token = 'OpbhmQpBO8KhUb9G6oO+cO0b+SyfqLnR73ECL3bRqrA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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