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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b105b35444e756d16a1578b454ec95be84d1243524d4d2927324c0b299a2da07' 
  AND token = 'BIy/CwmCmErS/1DVd4dk8lvf43Fpczie3w0Gf7uGca8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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