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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '06d48e5020a60aba7917c3447ff098b9b7f6b979ce0195c1f1cdb09ac683b53c' 
  AND token = 'rElzcgYtq/JbywBD2q6Ob/xHALAkAKZnoQbl6RTCMDw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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