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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6b9c3b805d4b79c03e521f68a66b35bd5525a7b4469014cc966daebfcfcba7bf' 
  AND token = 'xyJyzM21s8WN9FhVWPPVp+nNsNdC23ycneCfiwnHaIQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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