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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '11972ecfd0166ceddf7815aeb8dbc5a8e7b3e9d0e6614ef5283ec00750c67b39' 
  AND token = 'BwCGOtL8k6GrRTMBc9wHB0R9clIsjDKVURRnn3x+1nY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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