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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c59b32061874dd0835279d3e8dbe1627238bf1a7100388d464f066290f50ca96' 
  AND token = '2wE+nbWtYfyi3dSKzObROf84K7Oqyh9I7wprRICEdmY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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