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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '06a5bb2230d5ef90ddd6bbf1a51abddb833d47783ecf4fadd77927e7be620a9b' 
  AND token = '4tdapEJJyjk/wd/50HAmmgY00qQQYOn6xq2asGXPOAg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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