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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '72f9d513656b418c9d896546346ef6f7fab6945369853960ee06a62dfce40e55' 
  AND token = 'CxwZx4WIuLAU2j5+nMEjHHXBHN/rnaSQi+KL9YX79DQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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