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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb1a3b27796f845603c3fafeb5d31a7e9052acca60339d500541372dbde946d3' 
  AND token = 'rd+wRadw5nygMma82x3F/xyz3QLdOMrvx1pAv0RvYXc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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