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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '79e7ad680fbd49f2e20fc3f408f6ea604ec4b7e6253d60772cd59484d1fcd99d' 
  AND token = 'KoREjeaqn08W04CXiYM2/60gTB3yFgPkWW8mOA5jFGM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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